int estadoanterior=0;
int estadoanterior2=0;
int estadoanterior3=0;
int estadoanterior4=0;
int estadoanterior1=0;

int sensor1=2;
int sensor2=3;
int sensor3=4;
int sensor4=5;
int stopper1=6;
int stopper2=7;
int stopper3=8;
int zona1=0;
int zona2=0;
int zona3=0;
int zona4=0;



#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

//Crear el objeto lcd  dirección  0x3F y 16 columnas x 2 filas

LiquidCrystal_I2C lcd(0x20,16,2);  //

LiquidCrystal_I2C lcd2(0x27,16,2);  //

void setup() {
  // Inicializar el LCD
  lcd.init();
   
  //Encender la luz de fondo.
  lcd.backlight();
   
  // Escribimos el Mensaje en el LCD.
lcd.setCursor(0,0);
lcd.print("CONVEYOR T88be");  
lcd.setCursor(0,1);
lcd.print("SECUENCIA");  
  pinMode(sensor1, INPUT);
  pinMode(sensor2, INPUT);
  pinMode(sensor3, INPUT);
  pinMode(sensor4, INPUT);
  pinMode(stopper1, OUTPUT);
  pinMode(stopper2, OUTPUT);
  pinMode(stopper3, OUTPUT);
  digitalWrite(stopper1, HIGH);
  digitalWrite(stopper2, HIGH);
  digitalWrite(stopper3, HIGH);
  }

void monitoreo () {
int lectura= digitalRead(sensor1);
if (lectura!=estadoanterior){
if (lectura== HIGH){
delay(100);
zona1=1;
}}

int lectura1= digitalRead(sensor2);
if (lectura1!=estadoanterior1){
if (lectura1== HIGH){
delay(100);
zona2=1;
}}

int lectura2= digitalRead(sensor3);
if (lectura2!=estadoanterior2){
if (lectura2== HIGH){
delay(100);
zona3=1;
}}

int lectura3= digitalRead(sensor4);
if (lectura3!=estadoanterior3){
if (lectura3== HIGH){
delay(100);
zona4=1;
}}}

void Secuencia (){

if (zona1==1 && zona2==0 && zona3==0 && zona4==0){
delay(1000);  
digitalWrite(stopper1, LOW);
delay(1000);
digitalWrite(stopper1, HIGH);
delay(1000);
digitalWrite(stopper2, LOW);
delay(1000);
digitalWrite(stopper2, HIGH);
delay(1000);
digitalWrite(stopper3, LOW);
delay(1000);
digitalWrite(stopper3, HIGH);
zona1=0;

}

if (zona1==1 && zona2==0 && zona3==0 && zona4==1){
delay(1000);  
digitalWrite(stopper1, LOW);
delay(1000);
digitalWrite(stopper1, HIGH);
delay(1000);
digitalWrite(stopper2, LOW);
delay(1000);
digitalWrite(stopper2, HIGH);
zona1=0;
}

if (zona1==1 && zona2==0 && zona3==1 && zona4==1){
delay(1000);  
digitalWrite(stopper1, LOW);
delay(1000);
digitalWrite(stopper1, HIGH);
delay(1000);
digitalWrite(stopper2, LOW);
delay(1000);
digitalWrite(stopper2, HIGH);
}

if (zona1==1 && zona2==1 && zona3==1 && zona4==1){
delay(1000);  
digitalWrite(stopper1, HIGH);
delay(1000);
digitalWrite(stopper2, HIGH);
}}

void loop() {
monitoreo ();
Secuencia ();
  
}